120 lines
2.7 KiB
ArmAsm
120 lines
2.7 KiB
ArmAsm
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// TITLE("Asynchronous Procedure Call (APC) Interrupt")
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//++
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//
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// Copyright (c) 1990 Microsoft Corporation
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//
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// Module Name:
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//
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// apcint.s
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//
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// Abstract:
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//
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// This module implements the code necessary to field and process the
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// Asynchronous Procedure Call (APC) interrupt.
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//
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// Author:
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//
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// William K. Cheung (wcheung) 1-Nov-1995
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//
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// Environment:
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//
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// Kernel mode only, IRQL APC_LEVEL.
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//
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// Revision History:
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//
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// 08-Feb-1996 Updated to EAS2.1
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//
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//--
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#include "ksia64.h"
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.file "apcint.s"
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//++
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// Routine
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//
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// VOID
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// KiApcInterrupt(PKINTERRUPT, PKTRAP_FRAME)
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//
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// Routine Description:
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//
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// This routine is entered as the result of a software interrupt generated
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// at APC_LEVEL. Its function is to allocate an exception frame and call
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// the kernel APC delivery routine to deliver kernel mode APCs and to check
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// if a user mode APC should be delivered. If a user mode APC should be
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// delivered, then the kernel APC delivery routine constructs a context
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// frame on the user stack and alters the exception and trap frames so that
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// control will be transfered to the user APC dispatcher on return from the
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// interrupt.
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//
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// Arguments:
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//
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// a0 - Supplies a pointer to interrupt object.
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//
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// a1 - Supplies a pointer to a trap frame.
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//
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// Return Value:
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//
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// None.
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//
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//--
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.global KiSaveExceptionFrame
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.type KiSaveExceptionFrame, @function
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.global KiDeliverApc
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.type KiDeliverApc, @function
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NESTED_ENTRY(KiApcInterrupt)
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.regstk 2, 3, 3, 0
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.prologue 0xC, savedpfs
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alloc savedpfs = ar.pfs, 2, 3, 3, 0
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mov savedbrp = brp
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add t0 = TrPreviousMode, a1
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;;
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.fframe ExceptionFrameLength
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add sp = -ExceptionFrameLength, sp
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ld4 loc2 = [t0] // PreviousMode'size = 4-byte
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;;
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PROLOGUE_END
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//
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// Register definitions
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//
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pKern = pt0
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pUser = pt1
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//
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// Save the nonvolatile machine state so a context record can be
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// properly constructed to deliver an APC to user mode if required.
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//
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cmp.eq pUser = UserMode, loc2
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add out0 = STACK_SCRATCH_AREA, sp
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(pUser) br.call.spnt brp = KiSaveExceptionFrame
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;;
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mov out0 = loc2
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add out1 = STACK_SCRATCH_AREA, sp // -> exception frame
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mov out2 = a1 // -> trap frame
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br.call.sptk.many brp = KiDeliverApc
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;;
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//
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// deallocate exception frame and high floating pointer register save area
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//
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.restore
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add sp = ExceptionFrameLength, sp
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NESTED_RETURN
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NESTED_EXIT(KiApcInterrupt)
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